Department of Physical Electronics, School of Electrical Engineering, Fleishman Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel.
Opt Lett. 2010 Jul 15;35(14):2499-501. doi: 10.1364/OL.35.002499.
We investigate second-harmonic generation in a nonlinear photonic crystal having radial quasi-periodic order and continuous rotational symmetry. This device enables us to simultaneously phase match different nonlinear interactions in any arbitrary direction of propagation. We have fabricated such a crystal by electric field poling of a magnesium-doped stoichiometric LiTaO(3) and demonstrated frequency doubling of two different pump wavelengths at three different angles. Fourier coefficients were 10 times higher than that of a lattice-based multidirectional frequency doubler.
我们研究了具有径向准周期和连续旋转对称性的非线性光子晶体中的二次谐波产生。这种器件使我们能够在任何传播方向上同时相位匹配不同的非线性相互作用。我们通过对掺镁的化学计量 LiTaO(3)进行电场极化来制造这种晶体，并在三个不同的角度演示了两个不同泵浦波长的倍频。傅里叶系数比基于晶格的多方向倍频器高 10 倍。
